Gasoline Direct Injection: Notes
Ford is adding gasoline Direct Injection (DI) to many of its engines for improved fuel economy, performance and emissions. Most engines will also incorporate a turbocharger when they go to DI, however, some engines will not. Engines with turbo charging are designated as GTDI (Gasoline Turbo Direct Injection) and engine without turbo charging are designated GDI (Gasoline Direct Injection).
The fuel systems for both of these variants are very similar. The only difference is that the GDI engine does not have the turbo controls that consist of the Turbocharger, Wastegate Control Valve, Compressor Bypass Valve and the sensor that contains the Throttle Inlet Pressure Sensor (TCB-A) and Throttle Charge Temperature Sensor (CACT)
Ford's first GTDI engine was introduced in the 2010 MY. The 3.5 L GTDI engine was based off the 3.5L IVCT engine used in the Taurus, Edge, etc. The GTDI version was introduced in the 2010 MY Ford Flex, Lincoln MKR (CUV), Taurus and Lincoln MKS (sedan).
The PCM for the GTDI engine controls the following sensors and actuators:
Outputs/Actuators: Electronic Throttle Control, Variable Cam Timing (Intake only), Wastegate Control Valve, Compressor Bypass Valve, Ignition timing, Fuel injectors (Direct Injection), Fuel Rail Pressure Control Valve
Inputs/Sensors: MAP, Manifold Charge Temp, Throttle Inlet Pressure, Throttle Charge Temp, Intake Air Temp, BARO, Cylinder Head Temp, Cam & Throttle positions, Engine Speed, Fuel Rail Pressure, UEGO (front, control), HEGO (rear fuel trim)
For the 2011 MY, 3.5L/3.7L engine was upgraded from ICVT (Intake-only Variable Cam Timing) to TIVCT (Twin Independent Variable Cam Timing. The 3.5L GTDI engine in the F-150 is based off this upgraded engine (3.5L GTDI TIVCT). The DI and turbo controls, however, are unchanged.
For the 2011 MY, the Explorer will be available with a 2.0L GTDI engine with TIVCT. For 2012 MY, it is also available in the Edge. The DI and turbo controls are similar to the 3.5L GTDI with the exception that there is only one turbocharger.
For the 2012 MY, the Focus will be available with a 2.0L GDI engine with TIVCT. The controls are similar to the 2.0L GTDI engine. The only difference is that the GDI engine does not have the turbo controls that consist of the Turbocharger, Wastegate Control Valve, Compressor Bypass Valve and the sensor that contains the Throttle Inlet Pressure Sensor (TCB-A) and Throttle Charge Temperature Sensor (CACT)
Because GDI engine controls and OBD are a subset of the GDTI engine controls and OBD, they will all be described in this information.